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Board and Batten Calculator

Plan a board-and-batten accent wall: how many battens to use, the exact equal gap between them, and how many boards to buy.

Formulas reviewed 13 November 2026 · See the formula

Board and Batten Calculator

Wall
ft
ft
Battens
in

A nominal 1×4 is about 3.5 in (89 mm) wide.

in

The calculator adjusts the gap slightly so every space is equal.

Purchase
ft
Allowances
%

Extra material for spillage, cuts, uneven ground and breakage.

Cost estimate (optional)
USD each

Enter your local price to estimate cost. Prices vary by supplier and region.

Results

Vertical battens
8 battens
Exact gap between battens
16.57 in
42.1 cm
Boards to buy
13 boards
Total linear length
83.33 ft25.4 m
Vertical batten length (total)
59.33 ft18.08 m
Rail length (total)
24 ft7.32 m
  • Battens sit flush with both wall edges. Rails are assumed to be the same width as the battens.

Estimates only. Prices are your own inputs in USD; material properties vary by product and supplier.

About the board and batten calculator

The look of a board-and-batten wall depends on even spacing. Picking a nice gap such as 16 in rarely divides your wall exactly, so the last space ends up narrower than the rest. This calculator chooses the number of battens closest to your target gap and then works out the exact equal gap for your wall, with battens flush at both edges.

It also totals the vertical battens and optional top and bottom rails, and estimates how many stock boards to buy.

How to use it

  1. Enter the wall width and the height of the paneled area.
  2. Enter the batten face width (a nominal 1×4 is about 3.5 in / 89 mm).
  3. Enter your preferred gap; the result gives the exact gap to mark out.
  4. Choose whether to include top and bottom rails, and enter the length of the boards you will buy.

Formula

Number of gaps

g = round[(W − b) ÷ (s + b)]

Battens

n = g + 1

Exact gap

gap = (W − n × b) ÷ g

Batten length

each = H − 2 × b (with rails), else H
  • W = wall width, b = batten width, s = target gap, H = height. Boards are counted so that each vertical batten is a single uncut piece when the stock length allows.

Worked example: A 12 ft wide, 8 ft high wall with 3.5 in battens and a 16 in target gap

  1. Gaps = round[(144 − 3.5) ÷ 19.5] = round(7.2) = 7
  2. Battens = 8; exact gap = (144 − 8 × 3.5) ÷ 7 = 16.57 in
  3. Verticals = 8 × 89 in = 59.3 ft; rails = 2 × 12 ft = 24 ft
  4. 8 ft boards: 9 for verticals (with 10 % waste) + 4 for rails = 13

Result: 8 battens spaced 16 9/16 in apart; buy 13 eight-foot boards.

Assumptions and limitations

  • Battens are installed flush with both wall edges. Outlets, switches and windows are not accounted for.
  • Rails are assumed to be the same width as the battens.

Frequently asked questions

What is the best spacing for board and batten?

It is a design choice; gaps of roughly 12–24 in (30–60 cm) are common for interior accent walls. Use the calculator to make every gap equal.

What size boards should I use for battens?

1×3 or 1×4 boards (or MDF strips) are common for interior walls. Wider battens give a bolder look.

Do I need top and bottom rails?

Many designs use a top rail or a ledge and the existing baseboard as the bottom rail. Choose "vertical battens only" if you are keeping the baseboard.

Sources and further reading

Results are estimates for planning purposes. See our disclaimer for details.